Discerning subtle abnormal movements is often critical in making the correct neurologic diagnosis. However, many telltale movements are hardly visible to the nonspecialist's eye. Using Eulerian video magnification (EVM), which applies a spatial and temporal filtering algorithm to amplify movements digitally on (real-time) video,1 we present 3 neurologic patients in whom the diagnosis became obvious after video magnification (video on the Neurology® Web site at Neurology.org): idiopathic Parkinson disease, with a subtle asymmetric resting hand tremor; orthostatic tremor of the legs; and an inconspicuous generalized epileptic seizure. These cases suggest that EVM could be employed as a “microscope” for assessing or monitoring subtle abnormal movements.
Footnotes
Supplemental data at Neurology.org
Author contributions: Nasir Ahmad Aziz: drafting/revising the manuscript, study concept or design, analysis or interpretation of data, accepts responsibility for conduct of research and final approval, acquisition of data, study supervision. Martijn R. Tannemaat: drafting/revising the manuscript, analysis or interpretation of data, accepts responsibility for conduct of research and final approval.
Study funding: No targeted funding reported.
Disclosure: The authors report no disclosures relevant to the manuscript. Go to Neurology.org for full disclosures.
- © 2015 American Academy of Neurology
References
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